William, I see two topics here: one about a 12-string and another about the bigger picture of which guitars might make up a decent and varied collection for you. You have already had some helpful advice regarding a 12-string so can I pick up on the second topic?
After many years of playing just one my curiosity grew, as I see it has with you in your reply above, and I went through a phase of buying a range of guitars. Eventually I got to the point where I had 20 guitars. After a while I started to realise that some of these guitars were, in my hands, far better than others. Once I was certain, I sold the guitars that were not ideal for me - but no doubt would be ideal for someone else. I am intentionally not mentioning which brands or models I kept and which I sold as your experience will produce different results to mine. I would encourage you to enjoy the searching, the experimenting, the buying and selling as I have ended up with just a few guitars that I know are clearly the best ones for me and I can now look at other guitars knowing that I am content not to be thinking about what out there might be even better for me. I hope you have a great journey of discovery and end up as happy and content as I am - and do let us know which 12-string you opt for.